FLOOD10328

• County: Boulder
• Community: Lyons
• Stream Name: North Saint Vrain and Saint Vrain Creeks
• Title: Floodplain Information Report, North Saint Vrain Creek, Saint Vrain Creek, Floodplain Update, Town of Lyons, Boulder County, Colorado
• Date: 6/1/1998
• Prepared For: Lyons
• Prepared By: BRW, Inc
• Floodplain - Doc Type: Floodplain Report/Masterplan

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Floodplain Information Report
K:\35600\004\FLOODPLAIN INFORMATION REPORT doc

26

June

998

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Flood elevations and discharges for the 10-, 50-, 100-, and 500-year events for each reference
cross section are listed in Table 60 Selected cross-sections from throughout the study reach are
depicted, with the 10-, 50-, 100-, and 500-year water surface elevations, in the Technical
Appendix.

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A detailed description of the hydraulic analysis and Manning's
Technical Addendum.

report is

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Un"

included in the

Floodplain

0040

065

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Channel

030

040

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-1:L

TABLE 5
ROUGHNESS COEFFICIENTS

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North St. Vrain & St.
Floodplain Update

Vrain Creeks

Town of Lyons